<template>
  <div>
    <h1>{{ num }}</h1>
    <cop1 :num.sync="num" />
  </div>
</template>

<script>
import cop1 from "../components/cop1.vue"
export default {
  components: {
    cop1,
  },
  data() {
    return {
      num: 0,
    }
  },
}
</script>
